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My idea would be something around 1 merit for 2-4 activity periods, or we could make this to rank dependent or we could make it both posts and merit related (no idea of a formula yet and brain not helping kronk now)
But seriously, if you have 2000 posts and 1 merit in one year....there is something fishy happening.
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I like this one. I'm thinking about something similar.
Let's say, you have to "pay" 1 merit/month to be able to wear a paid signature (and you can only use your earned merits for it).
This way, there's no need to change the merit requirements for ranking up, because newbies can still become juniors if they manage to get 1 merit, juniors can rank up if they get more, etc...
So they will have a chance to become even a legendary sometime in the future.
But if they choose to use their earned merits to be able to take part in a signature campaign (in order to monetize their time spent here instead of ranking up), that's their own decision.
This way, you can stop spammers, because they will quickly fall back to newbie rank, if they take part in a signature campaing, but they don't post useful stuff.
If the members are taking part in a signature campaing and they post quality stuff, they will manage to rank up parallel with monetizing their skills and time (ideal situation).
1 merit per month is really not much for a good poster, but will stop spammers on the short run (I mean they would just have to stop spamming for money if they run out of merit. If they want, they can spam for free, but they won't... or they have to start posting quality stuff, if they want to wear signature again).
Individual signatures have to remain free in the future, and we should not restrict them to e.g. black and white or small font, etc... If someone wants to advertise himself with a kind of colorful signature like the paid campaigns have, why not...
The question is, how to decide if a signature is paid or free?
If theymos implements a kind of central signature database from where the campaign members can choose their paid signature, this would solve the problem for the decent campaigns.
But how to restrict shady ICOs, if they start to manage their campaigns off site and members say that their signatures are not paid? I know that it's possible to prove that they are paid in the end, but it requires effort and time from forum stuff or members.
Or we decide that having a signature is a kind of premium stuff here and that's not available for everyone (like the avatar). It's still better that you know that if you have the necessary merits, you can set up a signature (this is a kind of motivatoin to post quality stuff), compared to the situation when theymos just ban all the signatures...